In the Japanese version, Boss Xemnas was available in the thirty-seventh High Score Challenge from September 7 to 13, 2018.

In the English version, Boss Xemnas was available in the forty-second High Score Challenge from September 14 to 20, 2018. Players that managed to rank within the top 1000 received a boosted version of Boss Xemnas that has 1,000 more base strength and defense.[1]

In the English version, Boss Xemnas was available in the 01/18/19 - 01/21/19 "High Score Medal Deal".